Darden Restaurants–The restaurant chain is making an investor presentation focusing on increasing shareholder value this morning, and is still planning to spin off its Red Lobster chain despite calls from a major shareholder to delay that move.

Berkshire Hathaway–Warren Buffett's company reported record profit in its latest annual letter to shareholders. Buffett will appear on this morning's edition of Squawk Box until 9 a.m. Eastern, giving his thoughts on both his company and the overall market outlook, as well as answering viewer questions.

Citigroup–Citi is reportedly the subject of an SEC investigation, after the bank disclosed fraudulent loans in its Mexican unit on Friday. The SEC is said to be looking into possible accounting fraud and violations of the Foreign Corrupt Practices Act, according to Reuters.

Tyco–Tyco is selling its South Korean security business to the Carlyle Group for $1.93 billion in cash.

Caesars Entertainment–The casino operator has sold Bally's Las Vegas and other properties in that city to Caesars Growth Partners for $2.2 billion.

SodaStream–Barclays downgraded the stock to "equalweight" from "overweight". That comes after SodaStream's earnings report last week, in which it forecast 2014 revenue growth below analyst estimates.

Nokia–Canaccord Genuity upgraded the stock to "buy" from "hold", based on an anticipated increase in licensing revenue.

Apple–The company has rolled out its "CarPlay" technology today, with Mercedes, Volvo, and Ferrari the first automakers to include it. "CarPlay" allows iPhone users to receive messages, use maps, and make calls more easily.